Length–weight relationships (LWRs) were determined for six endemic fish species [Glyptothorax fokiensis (Rendahl, 1925), Lepturichthys fimbriata (Günther, 1888), Liobagrus marginatus (Günther, 1892), Percocypris pingi (Tchang, 1930), Pseudobagrus pratti (Günther, 1892) and Sinibotia superciliaris (Günther, 1892)] from the Pan Zhihua reach of the Jinsha River, which is located in the upper reaches of the Yangtze River, southwest China. Samples were obtained between May 2004 and April 2012 using various types of fishing gear and electroshock fishing techniques. For each species, the sample size, length range, weight range, LWR, 95% confidence intervals of a and b, and coefficient of correlation were determined. Values of b were between 2.306 for P. pratti and 2.934 for P. pingi, and r2 values ranged from 0.952 for G. fokiensis to 0.995 for P. pingi. Prior to this study, the LWRs for three of these endemic species were unknown.